Question 5:

Some changes are listed below, classify them as temporary and permanent.

a) Souring of curd

b) Ripening of oranges

c) The sawing off a piece of wood into two

d) Cooking of food

e) Heating of milk.

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Solution

(a) Permanent Change.

(b) Permanent Change.

(c) Permanent Change.

(d) Permanent Change.

(e)Temporary Change

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Question 3

Some changes are listed in the following table. For each change, write in the blank column, whether the change can be reversed or not.
$\begin{matrix} S.No. & Change & Can be reversed (Yes/No) 1. & The sawing of a piece of wood 2. & The melting of ice candy 3. & Dissolving sugar in wateer 4. & The cooking of food 5. & The ripening of a mango 6. & Souring of milk \end{matrix}$

Q. Categorise these changes as reversible or irreversible.
a. Melting of an ice candy
b. Cooking of food
c. Souring of milk

Q. Question 7
Which of the following are chemical changes?
(i) Decaying of wood
(ii) Burning of wood
(iii) Sawing of wood
(iv) Hammering of a nail into a piece of wood

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)

Q. Classify the two changes given below. Change I: Cutting a log of wood into pieces Change II: Burning a log of wood

Q. What is common to the changes mentioned below.
the setting of milk into curd; the rusting of iron; the ripening of a mango
(a) They are all reversible changes.
(b) They are slow reversible changes.
(c) They are fast reversible changes.
(d) They are slow irreversible changes.

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Question 5: Some changes are listed below, classify them as temporary and permanent. a) Souring of curd b) Ripening of oranges c) The sawing off a piece of wood into two d) Cooking of food e) Heating of milk.

(a) Permanent Change. (b) Permanent Change. (c) Permanent Change. (d) Permanent Change. (e)Temporary Change

Question 5:

Some changes are listed below, classify them as temporary and permanent.

a) Souring of curd

b) Ripening of oranges

c) The sawing off a piece of wood into two

d) Cooking of food

e) Heating of milk.

(a) Permanent Change.

(b) Permanent Change.

(c) Permanent Change.

(d) Permanent Change.

(e)Temporary Change